<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Cache Editor for DataGrid - jQuery EasyUI Demo</title>
    <link rel="stylesheet" type="text/css"
          href="../../themes/default/easyui.css">
    <link rel="stylesheet" type="text/css" href="../../themes/icon.css">
    <link rel="stylesheet" type="text/css" href="../demo.css">
    <script type="text/javascript" src="../../jquery.min.js"></script>
    <script type="text/javascript" src="../../jquery.easyui.min.js"></script>
</head>
<body>
<h2>Cache Editor for DataGrid</h2>
<p>This example shows how to cache the editors for datagrid to improve the
    editing speed.</p>
<div style="margin:20px 0;"></div>

<table id="dg" class="easyui-datagrid" title="Cache Editor for DataGrid"
       style="width:700px;height:auto"
       data-options="
				iconCls: 'icon-edit',
				singleSelect: true,
				toolbar: '#tb',
				url: 'datagrid_data1.json',
				method: 'get',
				onClickRow: onClickRow
			">
    <thead>
    <tr>
        <th data-options="field:'itemid',width:80">Item ID</th>
        <th data-options="field:'productid',width:100,
						formatter:function(value,row){
							return row.productname;
						},
						editor:{
							type:'combobox',
							options:{
								valueField:'productid',
								textField:'productname',
								method:'get',
								url:'products.json',
								required:true
							}
						}">Product
        </th>
        <th data-options="field:'listprice',width:80,align:'right',editor:{type:'numberbox',options:{precision:2}}">
            List Price
        </th>
        <th data-options="field:'unitcost',width:80,align:'right',editor:{type:'numberbox',options:{precision:2}}">
            Unit Cost
        </th>
        <th data-options="field:'attr1',width:250,editor:'text'">Attribute</th>
        <th data-options="field:'status',width:60,align:'center',editor:{type:'checkbox',options:{on:'P',off:''}}">
            Status
        </th>
    </tr>
    </thead>
</table>

<div id="tb" style="height:auto">
    <a href="javascript:void(0)" class="easyui-linkbutton"
       data-options="iconCls:'icon-save',plain:true"
       onclick="accept()">Accept</a>
    <a href="javascript:void(0)" class="easyui-linkbutton"
       data-options="iconCls:'icon-undo',plain:true"
       onclick="reject()">Reject</a>
    <a href="javascript:void(0)" class="easyui-linkbutton"
       data-options="iconCls:'icon-search',plain:true" onclick="getChanges()">GetChanges</a>
</div>

<script type="text/javascript">
    (function ($) {
        function getCacheContainer(t) {
            var view = $(t).closest('div.datagrid-view');
            var c = view.children('div.datagrid-editor-cache');
            if (!c.length) {
                c = $('<div class="datagrid-editor-cache" style="position:absolute;display:none"></div>').appendTo(view);
            }
            return c;
        }

        function getCacheEditor(t, field) {
            var c = getCacheContainer(t);
            return c.children('div.datagrid-editor-cache-' + field);
        }

        function setCacheEditor(t, field, editor) {
            var c = getCacheContainer(t);
            c.children('div.datagrid-editor-cache-' + field).remove();
            var e = $('<div class="datagrid-editor-cache-' + field + '"></div>').appendTo(c);
            e.append(editor);
        }

        var editors = $.fn.datagrid.defaults.editors;
        for (var editor in editors) {
            var opts = editors[editor];
            (function () {
                var init = opts.init;
                opts.init = function (container, options) {
                    var field = $(container).closest('td[field]').attr('field');
                    var ed = getCacheEditor(container, field);
                    if (ed.length) {
                        ed.appendTo(container);
                        return ed.find('.datagrid-editable-input');
                    } else {
                        return init(container, options);
                    }
                }
            })();
            (function () {
                var destroy = opts.destroy;
                opts.destroy = function (target) {
                    if ($(target).hasClass('datagrid-editable-input')) {
                        var field = $(target).closest('td[field]').attr('field');
                        setCacheEditor(target, field, $(target).parent().children());
                    } else if (destroy) {
                        destroy(target);
                    }
                }
            })();
        }
    })(jQuery);
</script>
<script type="text/javascript">
    var editIndex = undefined;

    function endEditing() {
        if (editIndex == undefined) {
            return true
        }
        if ($('#dg').datagrid('validateRow', editIndex)) {
            var ed = $('#dg').datagrid('getEditor', {
                index: editIndex,
                field: 'productid'
            });
            var productname = $(ed.target).combobox('getText');
            $('#dg').datagrid('getRows')[editIndex]['productname'] = productname;
            $('#dg').datagrid('endEdit', editIndex);
            editIndex = undefined;
            return true;
        } else {
            return false;
        }
    }

    function onClickRow(index) {
        if (editIndex != index) {
            if (endEditing()) {
                $('#dg').datagrid('selectRow', index)
                    .datagrid('beginEdit', index);
                editIndex = index;
            } else {
                $('#dg').datagrid('selectRow', editIndex);
            }
        }
    }

    function accept() {
        if (endEditing()) {
            $('#dg').datagrid('acceptChanges');
        }
    }

    function reject() {
        $('#dg').datagrid('rejectChanges');
        editIndex = undefined;
    }

    function getChanges() {
        var rows = $('#dg').datagrid('getChanges');
        alert(rows.length + ' rows are changed!');
    }
</script>
</body>
</html>